Terrorism expert on New Zealand attack and manifesto

A manifesto posted online that may have been written by the New Zealand attacker called for violence against immigrants. CBS News senior national security analyst and former White House Homeland Security adviser Fran Townsend joined CBSN with more on violent white nationalist ideologies and some words of caution about the manifesto.new zealand, new zealand mosque shootings, white supremacy, white supremacist, manifesto,